Thomas hanvey



oooooooooo I T. HANVEY. Apparatus for Grinding Wood Pulp.

308. Patented Ma UNITED STATES PATENT OFFICE.

THOMAS HANVEY, OF ROCHESTER, NEW YORK.

APPARATUS FOR GRINDING WOOD PULP.

SPECIFICATION forming part of Letters Patent No. 242,308, dated May 31,1881.

Application filed March 17, 1880.

T 0 all whom it may concern:

Be it known that I, THOMAS HANVEY, of Rochester, Monroe county, NewYork, have invented a certain new and useful Improvement in Apparatusfor Grinding Wood Pulp; and I do hereby declare that the following is afull, clear, and exact description of the same, reference being had tothe accom 'iauying drawings, in which- Figure 1 is a verticalcross-section of the apparatus. Fig. 2 is a similar section at rightangles to Fig. 1.

My improvement relates to apparatus for grinding pulp direct from thelog.

The invention consists in a certain arrangement of parts for feeding thelog down to the surface of the grimling-stone and producing pressure onthe same, as hereinafter more fully described.

In the drawings, A represents the log or bolt of wood from which thepulp is to be ground,and B represents the stone Whichdoes the grinding.The log is held at the ends by dogs a a, which are driven into itcentrally. The dogs are provided with journals 1) b, and at the outerends of the journals are pulleys c 0, one at each end of the log. Thelog thus prepared is capable of rotary motion when mounted in suitablebearings, and when power is applied by bands running on the pulleys 00,or by other means. The logA and stone B are both in a frame, 0, so thatrotary motion may be given to them in opposite directions, as indicatedby the arrows in Fig. 1. The journals of the stone rest in stationarybearings, but those of the log rest in vertical slots (1 d, on oppositesides of the frame, which extend so low toward the stone that when thejour- (No model.)

nals strike in their bottoms the log will be so nearly ground up thatonly a small core will be left.

D is a hand-lever, which rests over the top of the circular log; and Eis a pivoted link forming a fulcrum, to which the lever is attached bymeans of a hook, as shown in Fig. 1.

The stone may be stationary instead of revolving, if desired, and may bemade fiat instead of cylindrical.

By the use of the slots d d and thejournals I) b resting therein, thelog will fall centrally over the stone as fast as the surface is groundaway. By the use of the lever D the log can be held down to its workwith any degree of force desired, which will vary with the kind andcondition of the wood which is being acted on. The pressure on thislever also prevents wabblin g and jumping of the log. In case of unduespeed the lever may also be used as a brake.

Having thus described my invention, what Iclaim as new, and desire tosecure by Letters Patent, is-

In a pulp-machine, the combination, with the grinding-stone B, of thedogs a a, setinto the ends of the log, the slots at d in the frame, inwhich the journals I) b of the dogs rest, and the hand-lever D, restingon top of the log and forcing the same down to the stone, as shown anddescribed, and for the purpose specified.

In witness whereof I have hereunto signed .my name in the presence oftwo subscribing witnesses.

THOS. HA NVEY.

Witnesses:

R. F. ()SGOOD, OHAUNeEY PERRY.

